I have two XFX PVT42EUDE3 Geforce 6800 XTreme 256mb GDDR3 PCI Express x16. They support SLI, have strap connections (SLI cable is connected) on top and have PSU connections on side (They are hooked up to PSU & I am also using the ez plug on motherboard). The NVida software says they are enabled but have no way to test this. 3DMark 05 shows first PCIx16 with card but the 2nd PCIx16 slot shows available in system info in 3DMark. Just wondering if their is software to test SLI. Ran 3DMark 05 and both times were in the 6500's. I posted at Futuremark.